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[Webby the Bear]

Hi ya,

Can I use water or carb cleaner (I'm thinking maybe not CC cos of the heat) in a spray bottle to find exhaust leaks kinda like how you use carb cleaner to find vacuum leaks?

[tunnie]

Just use your hand? Should be able to easily find hot exhaust gasses 

[zirk]

Rizla paper. 

[omega3000]

Manifold 

[Webby the Bear]

See, problem is I have a definite exhaust blow. I've waved my hand over areas, used tissue paper etc and still cant find it. theres no black soot marks either.

So, will water or cc work?

[Andy H]

Carb cleaner finds leaks on the inlet because it gets sucked into the engine and makes a noticeable difference to the engines running.

Spraying carb cleaner onto the exhaust isn't going to work because the exhaust is blowing (and it might catch fire & destroy the car). I can't see water doing anything but turn into clouds of steam

How do you know the exhaust is blowing?

[martin42]

Get somebody to hold some rags over end of exhaust when engine is running,then have a look and listen to find where its blowing,if its not blowing the back pressure will stall engine.

[Webby the Bear]

Thanks Andy. I was just wondering if it would blow out...kinda like a whale blowing water out if ya get me

I've listened to it and so has my teacher. I get popping whilst driving and the idle is sometimes lumpy in time with the exhaust popping.

I jammed a load of exhaust paste over the joins from cat to centre section and it drove lovely and thenstarted coming back and as my cat is aftermarket im thinking its not joining correctly.... although I ve tried loads of times to get it to seat properly.

[martin42]

Did you use paste to join cat to manifold?

[Webby the Bear]

Did you use paste to join cat to manifold?

no mate just rejoined it with that metal ring gasket. I thought it was just paste needed between centresection and cat

[martin42]

Did you use a new gasket for cat to manifold or used old 1?

[Webby the Bear]

Yeah I used the old one mate. you reckon that could be shot?

[martin42]

Could well be,cant see the other joints breaking tho,only that 1

[omega3000]

Flexi joint 

[tunnie]

Flexi joint 

No Flexi on V6, assuming this is his 2.5 V6?